The Apollo 10 mission launched from Cape Kennedy on May 18, 1969 with Commander Thomas Stafford, Command Module Pilot John Young and Lunar Module Pilot Eugene Cernan. The mission included the first live color television transmission to Earth, which began three hours after launch when Apollo was 3,570 in space. The mission included another monumental event- a visit to the backside of the moon - and that's where the eerie music was heard coming through the module's radio.

Transcripts from the astronaut's discussions were released in 2008 but audio hasn't been available until featured on the Science Channel show. In the transcripts, you can see the astronauts discussing the noise:

"It sounds like, you know, outer space-type music."

"You hear that? That whistling sound? Whooooooooo!"

"Well, that sure is weird music!"

The noise lasted for more than an hour before the module was again in contact with Earth. Later transcripts indicate the astronauts were unsure if they should mention the noise to NASA.

NASA said the noise was caused by radios on the command module and lunar module interfering with each other but not all astronauts are buying that explanation.

"The Apollo 10 crew was very used to the kind of noise that they should be hearing. Logic tells me that if there was something recorded on there, then there was something there," Apollo 15 astronaut Al Worden said on the Science Channel program. "NASA would withhold information from the public if they thought it was in the public's best interest."

You can see parts of the Science Channel show and hear the sound yourself below. The full transcripts from the mission are also included below.